CATALOGUE OF SHIELD REPTILES. 



49 



end ; sternal plates six pair, thin ; the narrow lateral pro- 

 longations of the sternum covered with a pecuhar plate, 

 and often having some additional ones between it and the 

 sternal plates on the inner and marginal plates on the outer 

 side ; gular and anal plates small, generally united, trian- 

 gular. 



1. Macroclemys Temminckii. Temminck's Snapper. 



Carapace strongly three-keeled, rounded, deeply serrated 

 behind. 



Emys Lacertina, Bum. ^ Bib. MSS. 



Chelonura Temminckii, Troost, MSS., in Holbrook, N. A. 



Herpet. i. 147. t. 24. 

 Emysaurus Temminckii, Buin. Cat. Rept. Mus. H. N.\&. 



Hub. North America. 



a. Adult. North America (Mississippi). From the Zoo- 



logical Society. 



b. Adult. North America (Mississippi). Mr. Smith's 



Collection. 



e. Adult (stuffed). Very large. North America ; Louisi- 

 ana. Mr. Smith's Collection. 



Osteology. Tab. XXXVIII. fig. 2; Tab. XXXIX • 



Tab. XL. fig. 1, skull (adult). 



d. Skeleton. North America. Presented by John Dillon, 

 jun., Esq. 



b. Sternum broad, truncated before; sternal plates 12; 

 sterno-costal suture covered with three or four addi- 

 tional plates, and with the ends of the pectoral and 

 abdominal plates. 



Emydidee § B. e. Gray, Cat. Tfirt. B.M. 13. 



19. PLATYSTERNON. 



Head very large, covered with a thick hard horny case ; 

 jaws very strong. Neck very thick, short, subretractile, 

 with small granular scales. Limbs yery large, coutractUe, 

 not capable of being retracted into the shell, covered vrith 

 long lunate scales in front, and fringed on the outer hinder 

 sides. Toes 5 • 4, webbed to the claws ; claws very strong. 

 Tail elongate, cylindrical. Shell depressed, expanded, thin, 

 covered with thin horny shields. Sternum flat, broad, 

 truncated in front and behind, united to the thorax by a 

 bony symphysis, covered with the ends of the pectoral and 

 abdominal plates, and three small additional shields between 

 them and the marginal plates. Axillary and inguinal plates 



small or none. Sternal shields 1 2 ; gular pair very short, 

 broad, band-hke. Asia. 



Platysternon, Gray, Proc.Zool. Soc. 1831, 106; Cat. Tort. 

 B.M. 35 (1844). 



Bum. ^- Bib. Erp. G^n. ii. 345 ; Cat. Meth. R. 15. 

 Schlegel, F. Japan. 49. 

 Clemmys (Platysternon), Fitz. Syst. Rept. 29. 



1. Platysternon megacephalum. The Helmeted 

 Terrapen. 



Deep brown, edge of the shields grooved and slightly 

 radiately striated. Head brown-rayed ; cheeks pale spotted ; 

 sternum pale yellowish. 



Platysternon megacephalum. Gray, Proc. Zool. Soc. 1831, 

 lOG ; Ilhcsf. Ind. Zool. t. 

 Bum. ^ Bib. Erp. Ghi. ii. 345. t. 16. f. 2 ; Cat. Meth 



R. 15. 

 Schlegel, F. Japon. 49. 

 Clemmys (Platysternon) megacephalum, Fitz. Syst. Rept. 

 29. 



Hab. China. 



a. Stuffed (half-grown). China. Presented by J. R. 



Reeves, Esq. (Figured Illust. Ltd. Zool. t. .) 



b. Stuffed (adult). China. Gardens of the Zoological 



Society. 



Head . 



20. DEKMATEMTS. 



Toes ? Claws 



? Shell oblong, 

 convex, not keeled, sides rounded ; hinder edge expanded, 

 slightly reflexed, covered with very thin membranaceous 

 shields ; hinder marginal shield broad. Sternum flat, 

 rounded in front, notched behind ; the gular plates small, 

 triangular, united to the upper shell by a bony symphysis, 

 covered with the end of the pectoral and abdominal plates ; 

 the sterno-costal sutures covered with four moderate-sized, 

 distinctly defined plates ; the anterior small, and two hinder 

 largest. The axillary and inguinal plates none. The cavity 

 of the shell is scarcely contracted at the opening. South 

 America. 



Derniatemys, Gray, Ann. 4' Mag. Nat. Hist. 1847, 60 ; 

 Proc. Zool. Soc. 1847, 55. 

 TTiegm. Arch. 1848, 197. 



1. Dermatemys Mawii. Mawes' Dermatemys. 

 Tab. XXI. 



First vertebral plate seven-sided ; second, third and 

 fourth longer than broad. Shell pale brown, upper surface 

 covered with small close irregular depressions of a darker 

 brown colour ; shields pale, nearly transparent, very brittle 



